论文部分内容阅读
土-水特征关系是基质吸力和含水率之间关系。在反复干湿循环路径下土-水特征曲线呈现出毛细滞回特性。基于毛细滞回内变量理论和传统的土-水特征关系经验模型,提出了能模拟在任意干湿循环路径下土-水特征关系的修正模型。该模型比原模型增加了一个可逆参数,考虑了含水率的可逆变化,使扫描线在靠近边界线的时候斜率不会无限大,同时保留了原模型精度。通过与文献中的试验结果进行比较,修正模型可以更好地模拟非饱和土的土-水特征关系的循环滞回特性,并讨论了可逆参数的确定方法。
Soil-water characteristic relationship is the relationship between the matrix suction and water content. The soil-water characteristic curve exhibits capillary hysteresis characteristics under repeated wet-dry cycles. Based on the theory of capillary hysteretic internal variables and the traditional empirical model of soil-water characteristic, a modified model that can simulate soil-water characteristic under any wet-dry circulation path was proposed. Compared with the original model, the model adds a reversible parameter. Considering the reversible change of moisture content, the slope of the scan line will not be infinite when it is close to the boundary line, and the accuracy of the original model is preserved. By comparing with the experimental results in the literature, the modified model can better simulate the cyclic hysteresis characteristics of the soil-water characteristic relationship of unsaturated soils and discuss the method of determining the reversible parameters.